Double-walled vessel.



M. AN-AGKER.

DOUBLE WALLED VESSEL.

APPLICATION FILED JUNE 27, 1908.

9 l 9, 5 1 '7 Patented Apr. 27, 1909.

7/6572 65865 Zawwzl'av? I To all who m it"maj concern:

UNITED STATES PATENT O] FICE.

MAX ANACKER, OF BERLIN, GERMANY, ASSIGNOR TO AMERICAN THERMOS BOTTLE COMPANY, OF BROOKLYN, NEW YORK.

DOUBLE-WALLED .VESSEL.

Specification of Letters Patent.

Patented April 27, 1909.

7 Application filed June 27, 1908. Serial so. 440,687.

bj Be it known that I, MAX ANACKER, a subect of the German Emperor, and resident of erlin, Germany, have invented a new and useful Improvement in Double-Walled Vessels, of which the tollowing is a specification. This invention consists in a double walled vessel comprising inner and outer walls united with each other only at the mouth of thevessel and inclosing between them a rarefied space, and has for its object to provide a novel form of stiffening device interposed between the inner and outer walls at a distance from the mouth of the vessel.

In the accom anyin drawin s, Figure 1 represents a dou le walled vesse in vertical central section with the improved stiffening 'device ap lied thereto, Fig. 2 is a section These inner and outer walls are united with engaging each other only at the mouth of the vessel.

' A stiffening device for holding the innerwall spaced ,from the outer wall 13 provided, which device comprises a ring 4 spaced from both walls, said ring having outwardly projecting pointed lugs 5 struck therefrom for the outer wall and inwardly projecting pointed lugs 6 struck therefrom for engaging the inner wall. By forming the lugs in the manner described, I and enabled to bend and so adjust their extremities nearer to or farther from the ring so as to compensate for difierencesin width of the annular rarefied space-3, due to inaccurate centering oi' the cylindrioal walls, and thus to insure engagement of said lugs with said walls. The said lugs also, by reason of said construction, are resilient and thus afford an elastic support for VVhatI claim is:- 1. The combination with a double walled vacuum vessel, of a ring disposed in the space between the walls of said vessel and having outwardly and inwardly projectin lugs'engaging with the outer and inner we is respectively.

2. The combination with a double walled vacuum vessel, of a ring disposed in the space between the walls of said vessel and having outwardly and inwardly projecting lugs formed integrally with said ring and engaging with the outer and inner walls respectively.

3. The combination with a double walled vacuum vessel, of a ring disposed in the space between the walls of said vessel and having outwardly and inwardly projecting flexible lugs engaging with the outer and inner walls respectively.

4. A stiffening device for vacuum double walled bottles comprising a ring and a plurality of projecting lugs on the inner'and outer circumferential-peri heries thereof.

5. A stiffening device or vacuum double walled bottles comprising a ring and a plurality of projecting resilientlugs on the inner and outer circumferential eripheries thereof.

6. A stiflening device i br vacuum double walled bottles comprising a ring having on its periphery a plurality of-lugs having their presence of two witnesses, this eleventh day of June 1908.

MAX ANACKER.

Witnesses:

Hammer: RAUOHHOLZ HENRY llASPER. 

